Double telescope.



O. MAGKENSEN.

DOUBLE TELESCOPE.

APPLICATION FILED JULY 21, 1912.

1,067,532, Patented July 15, 1913.

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DOUBLE TELESCOPE.

' Specification of Letters Patent.

Patented July 15,1913.

Application filed July 31, 1912. Serial no. 712,327.

more particularly to hand-telescopes (fieldglasses, opera-glasses), in which the oculars are connected together by means ofa 0011- pling, usually in the form of a bridge, so that they may be unitedly focused. F or actuating this focusing mechanism a screw has been used up to the present, which was journaled in a female thread betweenthe single telescopes and the free end of which rotated as a journal inthe coupling-bridge. The screw either was given an inconveniently' large diameter and becamev correspondingly heavy or it wore rapidly, In either case the actuating disk of the screw increased the size and weight of the instrument;

These drawbacks may be avoided according to the invention by journaling the actuating means for the united focusingto the socket of one of the two oculars coaxially. With this arrangement a saving in weight and space is directly combined, because the sockets of the 'oculars already have approximately the circumference that is requisite for the actuating ring. The displacement of the ocular guided on the same ocular-socket, brought about by such an actuating ring, is again transmitted by means of the couphngbridge to the other ocular. A special advantags is gained in the case of the larger sizes of double telescopes, where up to now it en tailed an effort to reach the actuating disk, as the hand had at the same time to span one of the single telescopes.

The simplest way of carryin out the in-' vention is to let one ocular itsel serve as the actuating means by journaling it to its socket by means of a screw-thread. I

In order to insure the transmission of the motion of one ocular through the coupling bridge to the other ocular, it is advisable to connect the middle part of the couplingbridge in the direction parallel to the oculars by means of a guiding member with the double telescope ro er. When the double telescope has a j omt etweeu the single telescopes and a corresponding joint in the coupling-bridge, the guiding member will appropriately be disposed coaxially to the joints. The customary arrangement for compensating, by focusing one of the two oculars, any dilference in therefractive condition of the two eyes, is best fitted to that ocular, to which the actuating means for the united focusing does not belong. I

In the annexed drawing a constructional example of the invention is shown.

' The right-hand ocular a forms the actuating means for the united focusing and is for this purpose j ournaled in the interior of its ocular-socket b by means of a screwthread. The two singletelescopes .c and d are connected by means of a oint 0, al. Similarly the coupling-bridge consists of two members cand f, which are connected by means of a joint. To the member 6 a rod e is fixed, which is guided in the hollow joint-journal 0. The right-hand bridgemember f is rotatably j'ournaled on the ocular a. The left-hand bridge-member 0 carries a sleeve e which is guided on the lefthand ocular-socket g and on which the ocular h appertaining to this socket is journaled by means of a thread, which serves for the said separate focusing.

I- claim:

1. In adouble telescope two single telescopes connected together, an ocular in each telescope, guidedin its axial direction, a coupling-bridge between the said oculars for the united focusing of the latter, and actuating means for such focusing, journaled coaxially-to one' of the ocular sockets.

2. In a double telescope two single telescopes connected together, an ocular in each telescope, guided in its axial direction, a coupling-bridgebetween the said oculars for the united focusing of the latter and actuating means for such focusing, this means being one of the oculars itself, which ocular is journaled to its socket by means of a screw-thread. e

3. In a double'telescope two single telescopes connected together, an ocular in each telescope, guided in its axial direction, a coupling-bridge between the said oculars for the united focusing of the latter, a guiding member adapted to guide the coulars coniointly, which member connects the said coupling-bridge and the double telescope proper and is directed parallel to the oculars, and actuating means for the said focusing, this means being one of the oculars itself, which ocular is journaled to its socket by means of a screw-thread.

' 4. In a double telescope two single telescopes, an ocular in each telescope, a joint connecting the two telescopes, a couplingbridge between the said oculars for the united focusing of the latter, having a corresponding o1nt, a guiding member adapted to guide the oculars conjointly, which member connects the said coupling-bridge and the double telescope proper, is directed parallel to the oculars and disposed coaxially to the joints, -and actuating means for the said focusing, this means being one of the oculars itself, which ocular is .journaled to its socket by means of a screw-thread.

5., In a double telescope two single telescopes, an ocular in each telescope, a joint connecting the two telescopes, a couplingbridge between the said oculars for the united focusing of the latter, having a corresponding joint a guiding member adapted to guide the oculars conjointly, which member connects the said coupling-bridge and the double telescope proper, is directed parallel to the oculars and disposed coaxially to the joints, actuating means for the said focusing, this means being one of the oculars itself, which ocular is journaled to its socket by means of a screw-thread, and means adapted for independently focusing the other ocular relatively to the couplingbridge.

OTTO MACKENSEN.

Witnesses PAUL Km'ionn, RICHARD HAHN. 

